springboot 批量下载文件, zip压缩下载

一、使用hutool 工具类

效果：下载速度可以

1、依赖：hutool

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.26</version>
</dependency>

2、调用方式

import cn.hutool.core.util.*;
HttpServletResponse response;

List<String> resourceList = StrUtil.split(fileUrls, ",");
        List<File> fileList = resourceList.stream()
                .map(x->new File("文件路径" + 根据预览路径获取对应文件路径(x)))
                .toList();

        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        FileUtils.setAttachmentResponseHeader(response, zipName);

        ZipUtil.zip(response.getOutputStream(), Charset.defaultCharset(),true,null, ArrayUtil.toArray(fileList,File.class));

3、依赖工具类

import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.URLUtil;
import jakarta.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;

import java.io.*;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicReference;

public class FileUtils {

    /**
     * 百分号编码工具方法
     *
     * @param s 需要百分号编码的字符串
     * @return 百分号编码后的字符串
     */
    public static String percentEncode(String s) {
        return URLUtil.encode(s).replaceAll("\\+", "%20");
    }

    /**
     * 下载文件名重新编码
     *
     * @param response     响应对象
     * @param realFileName 真实文件名
     */
    public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) {
        String percentEncodedFileName = percentEncode(realFileName);

        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);

        response.addHeader("Access-Control-Expose-Headers", "Content-Disposition,download-filename");
        response.setHeader("Content-disposition", contentDispositionValue.toString());
        response.setHeader("download-filename", percentEncodedFileName);
    }

}

二、原生java方式

参考

使用ZipEntry压缩与解压缩-CSDN博客文章浏览阅读1.8w次，点赞4次，收藏31次。import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io_zipentryhttps://blog.csdn.net/sinat_34620530/article/details/54093862

java下载zip附件_zipentry通过链接下载附件-CSDN博客文章浏览阅读1.1k次。1. 将文件下载到文件夹中,打包zip放入浏览器/* * Copyright 2019 yifen7.com All right reserved. This software is the * confidential and proprietary information of yifen7.com ("Confidential * Information"). ..._zipentry通过链接下载附件https://blog.csdn.net/weixin_41564440/article/details/102631447

1、原生的下载

可以封装下载工具类，这里就没优雅实现（懒得改之前的代码）

import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

HttpServletResponse response = 前台获取;

 String fileName = "data_bk_" + getCurrentTimeStr();
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".zip");

        response.setContentType("application/octet-stream;charset=UTF-8");
OutputStream outputStream= null;
        ry {
            outputStream= response.getOutputStream();
            // 2 新建压缩包、文件扩展名根据驱动判断
        ZipOutputStream zos = new ZipOutputStream(outputStream);
String saveSqlName = "添加的文件名";

// 1.1 将备份的sql放入压缩包
        ZipEntry fileEntry = new ZipEntry(saveSqlName);
        zos.putNextEntry(fileEntry);

        // 1.2 通过文件流将该文件写入
String saveSqlFile = "d:\\xx.sql"
        FileInputStream fis = new FileInputStream(saveSqlFile);
        byte[] buffer = new byte[4096];
        int len;
        while ((len = fis.read(buffer)) != -1) {
            messageDigest.update(buffer, 0, len);
            zos.write(buffer, 0, len);
            zos.flush();
        }
        fis.close();
        zos.closeEntry();

//或者
/**
BufferedInputStream bis = new BufferedInputStream(
                    new FileInputStream(file));
            while ((count = bis.read(data, 0, bufferLen)) != -1) {
                zos.write(data, 0, count);
            }
bis.close();
zos.closeEntry();
**/
       

//2.1 多个文件重复操作...

        } catch (Exception e) {
            log.error("数据备份出错：{}", e);
        } finally {
            try {
                os.flush();
                os.close();
            } catch (IOException e) {
                log.error("数据备份出错：{}", e);
            }

        }